Mixer for plastics



Jan- 15,1935 F. H. BANBURY 1,987,659

MIXER FOR PLASTICS Filed May l2, 1955 .5 Sheets-Sheet l Jan. l5, 1935. F, H. BANBURY l MIXER FOR PLASTICS Filed May 12, 1953 sheets-sheet 2 W x um H\ d r 1M I m, im 10 HM.. A A 9N A A r FO., J .QJN E lawn. I -HHimHHiHE dhww I W v UWM Jam 15, ,1935- F. H. BANBURY MIXER FOR PLASTICS Filed May 12, 1935 f5 Sheets-Sheet 3 Patented Jan. l5, 1935 .1b. I c y f l f 1,987,659@

rnxER Fon PLASTICS' Fernley H. Banbury, Ansona, Conn. Application May v12, 1933, serial No. 670,653 f l y 9 claims. (01.1842) i vMy. present invention relates to -mixers Afor drawings, wherein I have `illustrated certain em- 'plastics and `devicesl of 'analogouscharacten and bodiments ofrmy invention and wherein: k'aims to provide certain improvements therein. Figure 1 is an end viewof a'Banbury mixer More particularly it has especial application to taken lsubstantially Yalong the plane of the line 5the'well'known-Banbur'y mixer which is designed 1-1 of yFig. 2. f

primarily 'for mixing or kneading raw rubber Fig.- 2is a side elevation of the mixer shown with compounding'ingredients ior'providing rubin-Fig. 1. l 'l I f ber mixes for various commercial purposes and Fig. 3 is an enlarged section taken substantially 'also for mixing or compounding other plastics along the plane of the line 3-3 offFig.1.`

10 having 'highviscosities. Types lof Banbury `mix Fig. 4 is an enlarged section taken substantially 10 'ers vto which my present invention'is applicable along the plane of theline 4-4 of Fig. 1. are illustrated and described in my prior Patents Figs. 5 and 6 are sections similarl to Fig. 3 show- Nos. 1,279,220, September 19;1918, and 1,818,449, ing additional embodiments of my invention.

AAugust11.11931, whichshow rubber mixers com- .Fig. "iis a-fractional endelevation of a'further vprisingz a Vcasing consisting essentially oifthre'e embodiment of a detachable neck plate. l5 '.-1'3a,1'1;s,:namely aside'member'having' a, single or Fig. 8 is a sectionrtaken substantially along Y`twin, substantially cylindrical troughs within the plane of thezline 8-8 of Fig. 1.

' which frotors'having blades or wings for kneading Referring to the drawings, letAiindicate a side the rubber are'rotatable, and a pair of end walls member of a mixer having twin, substantially "20 which close vthe ends of thetroughs. These end y.cylindrical troughs awithin which aredisposed 20 lwalls are usually integrally formed with vspaced hollow rotors `B'having shaft ends bwhich ex- 'jb'eari'ngs' whichV support ythe shaftsof'theY rotors. tend beyond the" ends of the side member.v At fflIn'devic'es" of the-characterdescribed, theiverthe lower region of union between the twin vticalinner faeesof the end walls which constitute troughs the side member is. formed withan open- 25 the ends of the mixing troughs are subject to ing within which isfittedfa slidable gate or door 25 someabrasionfduejto-the rubber stock or other C ina mannerwell known tothis Ytype of mamaterial being treated rubbing thereover; and chine. f At theupper regionofunion between ,the

als'oinpart-to the ends of the wings of the rotor twin troughs, the side 'member' yis formed with which at times vrub thereagainst. Heretofore 'anopening or neckportion 2awithin which, in

When-such abrasionorwear had become prothe operation of themachine, a floating weight 30 "nounced,the machine had to be dismantled so `.(not. shown) `is supp'orted'iby the mass of mal`thatthe end walls might be re`dressed or otherterial being treated within .the mixer. Mounted wis'e treated toftalxel "up this weari- 1 at.=eachf end of vtheside wallA is an end wallD According to my present invention I` greatly which is preferably `formed integrally with the 535 simplify and facilitate the compensating for such rotor shaft bearings d. wear-"by the provision of means which renderithe The fend walls Dare each" preferably provided dismantling 'of the machine'iunnecessary This with twin circular openings 2d which are of -I accomplish by forming the endwalls with large somewhat larger diameter than the troughs a. so openings which overlie the trougheend'sAv of Vthe Aas to completelyencircle and uncoverthe ends of y4.0 side member and mounting over said trough ends said troughs'lwhen the end walls are mounted in 40 detachable or separable rings or so-called rotor position relative to the side member. Extending end plateswhich'can be removed independently outwardlyfrom said 4circular openings the outer "of the end walls. `A urthe'r feature of novelty faces of theend walls are often beveled, as shown v`of my' present invention resides in the provision at 3d. Fitted within .the openings 2dfand deofv" detachable or separable plates for enclosing vtachably connectedto the side member Athrough -the lower part-:of the neck of the mixer whereby the medium of bolts eare rotor end plates lor rings iaccess can-be'gainedtothe interior ofthe neck AE which constitute, according to the present inportion'efthe-'mixer for releasing the lloating `vention, the endA walls of the troughs or mixing weightnorr'nally disposed therein or for? making chamber.' These rotor end plates E have central close inspection of the rotors withoutresorting to openings through which the. rotor shaftA ends ex- 50 Adismantling the machine. tend, said `openings beingof smaller diameter 1' The invention also includes other features of than the ends of the rotors which overlie the inner improvements whichwill be understood from the -faceof said plates.: The plates E at substantially detailed description which follows, when consid- 'the 'verticalcenter'line of the machine are formed fered- -in`4 conjunctionVH with the laccompanying with abuttingflat edges 2e and are reinforced along said abutting edges by an I-beam or the like 3e which is secured to the plates E by suitable bolts 4e, and preferably bears against the bearing b.

In Figs. 3 and 5 the central openings in the plates E are of substantially greater diameter than the rotor shafts passing therethrough, and the space between said shafts and rings are taken up by filler rings 2b which may be secured to the shaft by boltsgBb,asshownin--Fig.i3,or maybe force-,fitted y or shrunk onto said shaft, asshown in Fig. 5. Dust-excluding means are provided between the rings E and the shafts bi, in Fig. 3, these are in the form of Y y F which is carried by the ring E, saidringEHhaving an axial flange f, the innemedge of .which is held in contact with the ring 2b f the outer face of said ring having ainice sliding t with the inner periphery of the ring E. c-In Fig. 5, the inner edge of the ring 3f is held incon- -tatfwithztheendof the rotor Baby :the rspringf.

In Figs I; have shownthe rotorendiplateEgas formedatlitsinnerfperiphery with an axial -iiange ,efglisposed in closely spaced relation tojtheishaft b, and suitable dust-excluding means proyided `to Acooperateevvithfsaid flangeef. `These meansfcomprise a supporting ring G carried by the ,ringlE Land. a-ring.H.-mounted-.to rotate with the;` shaft b and having sliding movement; thereon, fdisposed `beztween :the ringGand ftheend of theaxial fiange e', the complemental facesof the ring -H;and the v.flangee being inibearingcontact. I-Forflubricatingthebearing faces of `,the ring `I-I and they flange e? Esaid-flange tis.. provided -iwith :lubricating 'channels 3e. i

.:The end-Walls D attheaneck portion ofthemachine are cutfaway orf-,omitted `casting said i -walls, e and f, separately detachable neck fend iplates rare-:provided for closing theineck Lendsfiof-the A machine. :,a'Asrshowniin Figs. landA, thesezplates --J'zare idirectlyfsecured -to y.the side :memberf-A :by

:preferablmformed wthiarcuatenonverging outer walls i tto ,-seat. :within :the :.saddleelike @opening formed :above .the abutting;- portions fof( vthefrotor end rings and f Ythus completely fclose: theri'erd :rwalls ofthe mixing chamber. 'I'heseplatessimay ebeyreinforcedxwith:angle iron members-fasir shown at .27,- ior they imaylbe :formed zwith :a hinged; door 3j; asV shown in .Fig:.7. .Also desired, theiplates .lwith :a fplate L glass ,.windoWAyso '.that the ,interior .ofithe mixing chamber cansbeinspectedfevithout r'removing'lthe platesv J `or openingit'he hinged door 31' thereof. 1 i' f f EThe operation `of the machine:describedfis` sub- .stantially identical with v:that `oft-the well.i known @Banbury mixer. .1Should,fhowevertheiinnerfaoe l of any of vthe rings Elbecom'efwornior( require inspection or attention, instead of completely-fdisr`mantling one-or-both of the--end"wallsiltofgain -accessto the'mixingchamber end Wallwhich--re- `quires'attention, the nuts on'thebolts e canibe removed andvany 'one or moreof the 'rotor' end platesjor rings can be detached for inspectionor removal for the necessary treatment. )Should vthis treatment require the complete removal of a rotor end plate, or ring from the machine,`this. may be accomplishedby making theringsEsectional, forjexamp'le, by having the ringssplit as shownat ,"5e. in'Fig. '1, tol provide substantially.semifcircular sections. flnnewmachines, howeverfthefringsfE .may vrbe ,made asintegral units,and when it,.be comes` necessary .to remove .la ring, .it .may bereut;

and as shovvflnj` a oating ring by ay spring 2f,

, ethe frotonshaft.-

apart with a torch or hammer and replaced by new ring sections.

Through the use of independently removable plates at the end of the neck portion of the machine it Will also be apparent that access can be 5 readily gained to the interior of the neck portion for releasing the floating Weight in the event that it becomes stuck therein, and also a more convenient and ready means is thereby provided for inspecting the/rotors andthemixingichamber as 10 al Awhole aticlose range. iforemechariipalfidefects. Where a hinged door is provided on the neck end `ietv` the machine, complete inspection of the interior thereof is greatly facilitated in going from -product. v ,Also.,by having the neck end plate removable or provided with a hinged door, minor i. repairsicanbeiimade to the rotors Without dismantling the machine, as is now necessary. By providing a plate glass window at the lower por- 2O tieni Qfithe neckfeelldswall; .lnfedditionitosiding in @the inspection of ,the rotorsfor-.defectsi itheiagtijon `ofthe irotorsgonfthe lmaterialibeing- ,treated njhe ,machinegcansbegwitnessedftoiadvantage.

i While Ighaverherein-shown severalembodiments 2,125 l.Qimmy inveniienfafnd the vmanners.:.fin whiormthe same may, bac arried 'intgpractic al operatiomg do not wish.tobegiimitedtofthe specificfconstructions disclosedgsince itfwillbefapparentithat the same A.may 1b yariedgwithim the;mangeant-engineering *30 .skillgfw hout-departingfrom the .spirit .of fini/encon@ llhaty Lclaimeis: i -v ir1 :mixerlor llikehaV-ing?afcamgm z,.prising, aT-sidefmember andfend .wallsfpmviding 435 .fa mixingohambenand ,ai rotor .'inesaidmhamber extending vthrough,.the-.end Walla-:said .end malls having sections :enoirclingthe retoriandidetachable yvvithout` first :removing snide-.end :Wllsyfihe f-saidsetionsgengagingithe ends 1of l:.theretgn:umd M0 bearingi the wear due 'tothe Irotation, ofithe motor.

Aemixerier, .the Klikei herring; a-fcasinc-f comprising a 4side .mernber.V .a1,1d.f czid..Y wells @secured i0 fsaidisidenmember andfipmvidincithezewithea ,-.mixing chambermand arf-rotor saidzsmamher-e -fextendingf.throughfthaend ewallafsaidendswells ,havingesetionsiencircling .the rotemA andsfindee-pendentlyfdetachable fromfthe. sidermemberrsaid @sectionsnengaging .the sends of i ithe frotorcand -bearing-the' wear d uedzo the'rotation oflthenrqtqr. W0

Y 3-.rA..-m-ixer or .thelikes.hairline4 atcasincgcomprisingfa',sidefmemberendfendffmlls, .fsaidriside member having-.a trough` :therein.whichawiththe fend mallsfprovides -za:mixingf-chambernavmtor fini-said ymixing.eeharriluer, said-vend meuse-having .openingshrgughfwhiclr(therotorrshaftxtends, vsaid openingssbeinezofflargeradiameterf-thenesaid .-,rotorfg-,and j plates-.surrounding said irotorwsheft, L.said ,plates beingiremovable, from itheimixeremith- 1tout,removngL-Saidend wal -V -=,-,4. or: the like.having e-icasingscemprisingea AAside:,membereandfend\Wa11s,l,said .fside `,memberhavingea troughthereinrwhichwith the mend; ,-walls, prevides y a mixing chamberg a'srotor A..ingsaid'gmixingechamber,said rendfwallsi-havmg `l openings through which .the rrotonshaftyextends, said .epeningabeipe lareen-idiametemhanmm v, trough .and E separate l. independently -f .removable .,.plates @195mg they opening Vin:tlfieiendiwallsgeroemd troughsthere1n,which,f s-with vthegendewallsgpro- VVigie a::mixing chamber, afrotordnfeachetrqiggn, W6

said end walls havi'ng openings through which the rotor shafts extend, said openings being larger than the cross-sectional area of the twin troughs, and separate plates encircling the rotor shafts closing the openings in the end walls.

6. A mixer or the like having a casing comprising a side member and end Walls, said side member having twin, substantially cylindrical troughs therein, which, with the end walls, provide a mixing chamber, a rotor in each trough, said end Walls having openings through which the rotor shafts extend, said openings being larger than the cross-sectional area of the twin troughs, separate plates encircling each of the rotor shafts closing the openings in the end walls, said plates common to each end Wall having partsin abutting relation and means for bracing said plates at their abutting parts.

7. A mixer or the like having a casing comprising a side member and end Walls, said side member having twin, substantially cylindrical troughs therein, which, with the end walls, provide a mixing chamber, a rotor in each trough, said end walls having openings through which the rotor shafts extend, said openings being larger than the cross-sectional area of the twin troughs, separate plates secured to the side member encircling the rotor shafts closing the openings in the end walls, said plates being in abutting relation in proximity to a center line of the mixing chamber and means for reinforcing said plates at said abutting parts.

8. A mixer or the like having a casing comprising a side member and end Walls providing a mixing chamber, a rotor in said chamber extending through the end walls, said end walls having sections encircling the rotor and detachable without iirst removing said end walls, said sections engaging the ends of the rotor and bearing the main longitudinal thrusts thereof, and dust-excluding means between said detachable sections and the rotor.

9. A mixer or the like having a casing cornprising a side member and end Walls secured to said side member, said side member having twin, substantially cylindrical troughs therein, which, with the end walls, provide a mixing chamber having a neck portion at its top, said end Walls having openings therein substantially concentric with, and of larger diameter than the twin troughs, said openings also overlying the ends of the neck portion, a rotor in each trough having a rotor shaft extending through the openings in the end Walls, rings encircling said rotor shafts closing the ends of the troughs, said rings at each end Wall being in abutting relation in proximity to the center line of the neck portion, a separate neck end wall section fitting in the opening at the end of the neck portion and seating in the saddle-like opening formed above the abutting portions of the rings, and said rings and neck end wall section being removable independently of the end walls.

FERNLEY H. BANBURY. 

